246 lines
8.4 KiB
C++
246 lines
8.4 KiB
C++
#include "postgres_connection.hpp"
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#include "postgres_error.hpp"
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#include "postgres_result_reader.hpp"
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#include "postgres_statement.hpp"
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#include "matador/object/attribute_definition.hpp"
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#include "matador/sql/error_code.hpp"
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#include "matador/sql/record.hpp"
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#include "matador/sql/internal/query_result_impl.hpp"
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#include <sstream>
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namespace matador::backends::postgres {
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postgres_connection::string_to_int_map postgres_connection::statement_name_map_{};
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postgres_connection::postgres_connection(const sql::connection_info &info)
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: connection_impl(info) {
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}
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utils::result<void, utils::error> postgres_connection::open() {
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if (is_open()) {
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return utils::ok<void>();
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}
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const std::string connection(
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"user=" + info().user + " password=" + info().password + " host=" + info().hostname + " dbname=" + info().database +
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" port=" + std::to_string(info().port));
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conn_ = PQconnectdb(connection.c_str());
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if (PQstatus(conn_) == CONNECTION_BAD) {
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const std::string msg = PQerrorMessage(conn_);
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PQfinish(conn_);
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conn_ = nullptr;
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return utils::failure(make_error(sql::error_code::OPEN_ERROR, nullptr, conn_, "Failed to connect"));
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}
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return utils::ok<void>();
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}
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utils::result<void, utils::error> postgres_connection::close() {
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if (conn_) {
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PQfinish(conn_);
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conn_ = nullptr;
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}
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return utils::ok<void>();
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}
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utils::result<bool, utils::error> postgres_connection::is_open() const {
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return utils::ok(conn_ != nullptr);
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}
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utils::result<bool, utils::error> postgres_connection::is_valid() const {
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return utils::ok(PQstatus(conn_) == CONNECTION_OK);
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}
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utils::result<utils::version, utils::error> postgres_connection::client_version() const {
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const auto client_version = PQlibVersion();
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return utils::ok(utils::version{
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static_cast<unsigned int>(client_version / 10000),
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static_cast<unsigned int>((client_version % 10000) / 100),
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static_cast<unsigned int>(client_version % 100)
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});
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}
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utils::result<utils::version, utils::error> postgres_connection::server_version() const {
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const auto server_version = PQserverVersion(conn_);
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if (server_version == 0) {
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return utils::failure(make_error(sql::error_code::FAILURE, nullptr, conn_, "Failed to get server version"));
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}
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return utils::ok(utils::version{
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static_cast<unsigned int>(server_version / 10000),
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static_cast<unsigned int>((server_version % 10000) / 100),
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static_cast<unsigned int>(server_version % 100)
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});
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}
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utils::result<std::unique_ptr<sql::query_result_impl>, utils::error> postgres_connection::fetch(const sql::query_context &context) {
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PGresult *res = PQexec(conn_, context.sql.c_str());
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if (is_result_error(res)) {
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return utils::failure(make_error(sql::error_code::FETCH_FAILED, res, conn_, "Failed to fetch", context.sql));
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}
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// std::vector<object::column_definition> prototype;
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// const auto num_col = PQnfields(res);
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// for (int i = 0; i < num_col; ++i) {
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// const char *col_name = PQfname(res, i);
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// auto type = PQftype(res, i);
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// auto size = PQfmod(res, i);
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// prototype.emplace_back(col_name);
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// }
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return utils::ok(std::make_unique<sql::query_result_impl>(std::make_unique<postgres_result_reader>(res), context.prototype));
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}
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std::string postgres_connection::generate_statement_name(const sql::query_context &query) {
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std::stringstream name;
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name << query.table.name << "_" << query.command_name;
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auto result = postgres_connection::statement_name_map_.find(name.str());
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if (result == postgres_connection::statement_name_map_.end()) {
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result = postgres_connection::statement_name_map_.insert(std::make_pair(name.str(), 0)).first;
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}
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name << "_" << ++result->second;
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return name.str();
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}
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utils::result<std::unique_ptr<sql::statement_impl>, utils::error> postgres_connection::prepare(const sql::query_context &context) {
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auto statement_name = postgres_connection::generate_statement_name(context);
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PGresult *result = PQprepare(conn_, statement_name.c_str(), context.sql.c_str(),
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static_cast<int>(context.bind_vars.size()), nullptr);
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if (is_result_error(result)) {
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return utils::failure(make_error(sql::error_code::PREPARE_FAILED, result, conn_, "Failed to prepare", context.sql));
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}
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std::unique_ptr<sql::statement_impl> s(std::make_unique<postgres_statement>(conn_, result, statement_name, context));
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return utils::ok(std::move(s));
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}
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utils::result<size_t, utils::error> postgres_connection::execute(const std::string &stmt) {
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PGresult *res = PQexec(conn_, stmt.c_str());
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if (const auto status = PQresultStatus(res); status != PGRES_COMMAND_OK &&
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status != PGRES_TUPLES_OK) {
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return utils::failure(make_error(sql::error_code::FAILURE, res, conn_, "Failed to execute", stmt));
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}
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const auto affected_rows = utils::to<size_t>(PQcmdTuples(res));
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PQclear(res);
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return utils::ok(static_cast<size_t>(affected_rows));
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}
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utils::basic_type string2type(const char *type) {
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if (strcmp(type, "int2") == 0) {
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return utils::basic_type::type_int16;
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} else if (strcmp(type, "int4") == 0) {
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return utils::basic_type::type_int32;
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} else if (strcmp(type, "int8") == 0) {
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return utils::basic_type::type_int64;
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} else if (strcmp(type, "bool") == 0) {
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return utils::basic_type::type_bool;
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} else if (strcmp(type, "date") == 0) {
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return utils::basic_type::type_date;
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} else if (strcmp(type, "timestamp") == 0) {
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return utils::basic_type::type_time;
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} else if (strcmp(type, "float4") == 0) {
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return utils::basic_type::type_float;
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} else if (strcmp(type, "float8") == 0) {
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return utils::basic_type::type_double;
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} else if (strncmp(type, "varchar", 7) == 0) {
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return utils::basic_type::type_varchar;
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} else if (strcmp(type, "character varying") == 0) {
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return utils::basic_type::type_varchar;
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} else if (strcmp(type, "text") == 0) {
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return utils::basic_type::type_text;
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} else if (strcmp(type, "bytea") == 0) {
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return utils::basic_type::type_blob;
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} else {
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return utils::basic_type::type_null;
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}
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}
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utils::result<std::vector<object::attribute_definition>, utils::error> postgres_connection::describe(const std::string &table) {
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const std::string stmt(
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"SELECT ordinal_position, column_name, udt_name, data_type, is_nullable, column_default FROM information_schema.columns WHERE table_schema='public' AND table_name='"
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+ table + "'");
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PGresult *res = PQexec(conn_, stmt.c_str());
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if (is_result_error(res)) {
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return utils::failure(make_error(sql::error_code::DESCRIBE_FAILED, res, conn_, "Failed to describe", stmt));
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}
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postgres_result_reader reader(res);
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std::vector<object::attribute_definition> prototype;
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while (auto fetched = reader.fetch()) {
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if (!fetched.is_ok()) {
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return utils::failure(fetched.release_error());
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}
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if (!*fetched) {
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break;
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}
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char *end = nullptr;
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// Todo: Handle error
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auto index = strtoul(reader.column(0), &end, 10) - 1;
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std::string name = reader.column(1);
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// Todo: extract size
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auto type = (string2type(reader.column(2)));
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end = nullptr;
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object::null_option null_opt{object::null_option::NULLABLE};
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if (strtoul(reader.column(4), &end, 10) == 0) {
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null_opt = object::null_option::NOT_NULL;
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}
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// f.default_value(res->column(4));
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prototype.emplace_back(name, type, utils::null_attributes, null_opt, index);
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}
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return utils::ok(prototype);
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}
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utils::result<bool, utils::error> postgres_connection::exists(const std::string &schema_name, const std::string &table_name) {
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const std::string stmt(
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"SELECT 1 FROM information_schema.tables WHERE table_schema = '" + schema_name + "' AND table_name = '" + table_name
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+ "'");
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PGresult *res = PQexec(conn_, stmt.c_str());
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if (is_result_error(res)) {
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return utils::failure(make_error(sql::error_code::TABLE_EXISTS_FAILED, res, conn_, "Failed check if table exists", stmt));
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}
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return utils::ok(utils::to<size_t>(PQcmdTuples(res)) == 1);
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}
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std::string postgres_connection::to_escaped_string(const utils::blob& value) const
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{
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size_t escapedDataLength;
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unsigned char *escapedData = PQescapeByteaConn(conn_, value.data(), value.size(), &escapedDataLength);
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return {reinterpret_cast<char*>(escapedData), escapedDataLength-1};
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}
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}
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extern "C" {
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MATADOR_POSTGRES_API matador::sql::connection_impl *create_database(const matador::sql::connection_info &info) {
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return new matador::backends::postgres::postgres_connection(info);
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}
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MATADOR_POSTGRES_API void destroy_database(matador::sql::connection_impl *db) {
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delete db;
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}
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}
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